China’s 8½-ton space lab is falling, will plunge to Earth by March
China's Tiangong-1 space lab was billed as a potent symbol of the country's rise when it launched in 2011. Now, the lab is out of control and expected to crash-land on Earth by the end of March -- posing a minuscule risk to humans but inflicting a blot on the nation's bold push to become a space superpower.